[woodbinite]

I'm about to install a plumbing protection cage and need some information. These questions apply to a 2006 3124. Does any one know the plywood floor thickness under the tub area? I'd like to lag bolt the rear of the cage in the location just aft of the fan housing. Second, are the exterior walls mounted onto steel channel, and if so, does anyone know it's size? It would make a great anchor point also for the rear of the cage. The front portion of the cage will mount to the steel extension behind the wheel well. Thanks in advance.